#!/usr/bin/node

const user={
  name:'王定',
  age:19,
  qq:'1234567'
};
const log=console.log;
log('name:%s',user.name);
log('age:%d',user.age);
log('user:%j',user);

log('qq:%s',user.qq);
log('qq:',user.qq);
log('qq:'+user.qq);
log(`qq:${user.qq}`);
